If a train leaves at a station at 2315 hours and arrives at 0330 hours what is its journey time

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Acircle has a circumference of 7.850 units. what is its radius?

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.